用PHP中的变量文本替换精确的变量字符串？

Question

I'm working on a replying system similar to twitters.
In a string there is a piece of text where the id is variable ex.: 14& , 138& depending to who you're replying.
How can I find the 14& in a string and replace it with <u>14&</u>?

This is how it looks:

14& this is a reply to the comment with id 14

This is how it should look like:

<u>14&</u> this is a reply to the comment with id 14

How can I do this in PHP? Thanks in advance!

Answer 1

$text = "14& this is a reply to the comment with id 14";

var_dump(preg_replace("~\d+&~", '<u>$0</u>', $text));

outputs:

string '<u>14&</u> this is a reply to the comment with id 14' (length=52)

To get rid of the &:

preg_replace("~(\d+)&~", '<u>$1</u>', $text)

outputs:

string '<u>14</u> this is a reply to the comment with id 14' (length=51)

$0 or $1 will be the your id. You can replace the markup with anything you like.

for instance a link:

$text = "14& is a reply to the comment with id 14";

var_dump(preg_replace("~(\d+)&~", '<a href="#comment$1">this</a>', $text));

outputs:

string '<a href="#comment14">this</a> is a reply to the comment with id 14' (length=66)